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/*
* Copyright (C) 2009 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.gson;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import com.google.gson.internal.Streams;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonToken;
import com.google.gson.stream.MalformedJsonException;
/**
* A parser to parse Json into a parse tree of {@link JsonElement}s
*
* @author Inderjeet Singh
* @author Joel Leitch
* @since 1.3
*/
public final class JsonParser {
/** @deprecated No need to instantiate this class, use the static methods instead. */
@Deprecated
public JsonParser() {}
/**
* Parses the specified JSON string into a parse tree
*
* @param json JSON text
* @return a parse tree of {@link JsonElement}s corresponding to the specified JSON
* @throws JsonParseException if the specified text is not valid JSON
*/
public static JsonElement parseString(String json) throws JsonSyntaxException {
return parseReader(new StringReader(json));
}
/**
* Parses the specified JSON string into a parse tree
*
* @param reader JSON text
* @return a parse tree of {@link JsonElement}s corresponding to the specified JSON
* @throws JsonParseException if the specified text is not valid JSON
*/
public static JsonElement parseReader(Reader reader) throws JsonIOException, JsonSyntaxException {
try {
JsonReader jsonReader = new JsonReader(reader);
JsonElement element = parseReader(jsonReader);
if (!element.isJsonNull() && jsonReader.peek() != JsonToken.END_DOCUMENT) {
throw new JsonSyntaxException("Did not consume the entire document.");
}
return element;
} catch (MalformedJsonException e) {
throw new JsonSyntaxException(e);
} catch (IOException e) {
throw new JsonIOException(e);
} catch (NumberFormatException e) {
throw new JsonSyntaxException(e);
}
}
/**
* Returns the next value from the JSON stream as a parse tree.
*
* @throws JsonParseException if there is an IOException or if the specified
* text is not valid JSON
*/
public static JsonElement parseReader(JsonReader reader)
throws JsonIOException, JsonSyntaxException {
boolean lenient = reader.isLenient();
reader.setLenient(true);
try {
return Streams.parse(reader);
} catch (StackOverflowError e) {
throw new JsonParseException("Failed parsing JSON source: " + reader + " to Json", e);
} catch (OutOfMemoryError e) {
throw new JsonParseException("Failed parsing JSON source: " + reader + " to Json", e);
} finally {
reader.setLenient(lenient);
}
}
/** @deprecated Use {@link JsonParser#parseString} */
@Deprecated
public JsonElement parse(String json) throws JsonSyntaxException {
return parseString(json);
}
/** @deprecated Use {@link JsonParser#parseReader(Reader)} */
@Deprecated
public JsonElement parse(Reader json) throws JsonIOException, JsonSyntaxException {
return parseReader(json);
}
/** @deprecated Use {@link JsonParser#parseReader(JsonReader)} */
@Deprecated
public JsonElement parse(JsonReader json) throws JsonIOException, JsonSyntaxException {
return parseReader(json);
}
}